ErrorDocument doesn't seem to be working in my .htaccess

[kmone]

Can anyone advise please? I'd like to have the default page for visitors to my site as being index.php and for all non-existent pages the visitor should see errordoc.phpSo I've put this in the .htaccess:\[code\]ErrorDocument 404 /errordoc.phpOptions +FollowSymLinksRewriteEngine OnRewriteBase /RewriteCond %{HTTP_HOST} !^mysite\.org\.uk$ [NC]RewriteRule ^(.*)$ http://mysite.org.uk/$1 [R=301,L]RewriteCond %{REQUEST_FILENAME} !-fRewriteCond %{REQUEST_FILENAME} !-dRewriteRule . /index.php [L]\[/code\]Unfortunately everything is going to index.php, including errors. I've tried asking my friend Google but it's his day off today!